Improvement in machines for grinding cylindrical-fluted cutters



NVPEI'ERS, PHOTO-LITHOGRAPHER. WASHINGTON. D CA is upheld by a. screw, q, passed downward through it, and resting upon the top of the carriage-platform; hence it will be apparent that by the aid of these screws and bars the horizontal adjustment ot' the mandrel and cutter is secured,`sincc it becomes necessary to vary this horizontal' position of the mandrel, or its parallelism with'respect to the upper snrface of the carriage-platform and its supporting-ways, in order to adapt the machine to cutters of a tapering or frusta-conical outline.

NVe have now seen how the vertical feeding or adjustinent of the ways (l d is effected, and also the horizontal adjustment of the cutter-mandrel, in relation to the. carriage-platform which carries it, and in pursuance of my invention it becomes necessary to providea means of insuringl the proper position of each tooth, in its turn, below the sharpening-wheel, in order that tl1e -periphery of the wheel shall bear firmly upon its cutting-edge while making a traverse of it.

To this end I erect, upon the front part of the outer way d, a standard or post, lr, and to the upper part of this post I attach, with an adjustable connection, a bracket, s, and to the upper surface of the shelf' t of such bracket I mount a movable stop-platev or abutment, u, the, union of the two heilig effected by a'bolt, fr, passing through a slot, ic, made in the plate, and screwing into the shelf, by which means the recession or approach of the plate, with respect to the cutter, may be varied. and determined accordingr to the width of the sharpening-wheel, and itsaction upon. the teeth of the cutter. p

To -insure contact of a tooth of the cutter Vwith the 4guiding-plate u, I apply, to the outer extremity of one ofthe journals of the mandrel p, a belt, chain, or equivalent object, y, such belt being passed once 0r twice abbut the journal, and having a weight, x, affixed to its opposite and pendent end, the gravityl of the weight tending to revolve the mandrel and cutter in a direction toward the stop, and, as a necessary result, serving to hold tightly to it the ,tooth of the cutter which may at the time be impinging against it. f

The variable attachment of the guide-plate u, to its p oint of support, enables me to graduate its position relatively tothe sharpening-wheel; hence I aml enabled to insure the contact of' the two in such respective positions as to secure a uniform wear upon the wheel,`according to the width of its periphery, and to obtain the best results in other respects.

'The guiding-plate o'r its equivalent becomes an important feature of the machine, in case a cutter is to be sharpened whose teeth are placed obliquely to its axis, as but for this stop or it's equivalent, the sharpening-wheel would leave the face of .the tooth at some point in its length, unless the width ofthe Wheel were of sufficient extent to cover the extreme variations of the departure of the tooth from a line parallel to the axis ofthe cutter, should such cutter travel in union with or in thcsame path as the carriages.

In practice, it will undoubtedly be found impracticable to employ a sharpening-wheel of sufficient width to accomplish this, and also, which is of. more import-ance, that 'the action of the wheel upon the cutting-edge of -the tooth would not be as favorable, owing to a change in its angle of cut upon such tooth, between the two` ends of the latter. Therefore, as above observed, lthe'gl'riding-plate becomes an important, if not an indispensable feature of my invention. l

To provide against creasing of the sharpeningwheel, and consequently of the cutting-face of the cutting-teeth, which, Aas Qmechanics will understand,

A would ensue, did such wheel travel at all times in the same orbital path, I mount a short horizontal shaft, e',

in bearings f g', erected upon the tablet of the machine-flame, in rear of the head-stock, and invlongitudinal alignment with its arbor C, such shaft e' beingslowly revolved by a belt travelling about a pulley, 71,', aflixcd to it. f

The forward part of the said shaft c carries a cam, i', to produce endwise reciprocat-ions of the arbor C and of the sharpening-stone, such endwise move- :ment being produced by extending the ange into the channel jl of a groovedI whech' l', mounted upon the rear extremity ofthe outer journal of the arbor, as represented in fig. 4 of the accompanying drawrlhe pinion-shaft' should be supplied with a. wrench, Z, by which to rotate it in either direction,

'ln operating with the said machine, the cuttervmandrel is to be removed from its support, and the cutter slipped upon it, the mandrel being supplied with a nut, j', and screw-thread k', for securing the cutter in place thereupon,which being done, the mandrel is returned to place.

'lhe sharpening-wheel is then put in rapid revolution, and the workman, seiziugythe crank in his right hand, revolves the pinion in` such a direction as to produce a traverse movement of the carriage '-e below the sharpening-wheel, which brings the latter in lcontact with the cutting-teeth of the cutter, and reduces such face to an even land sharp cuttingedge. y

The transverse movement of the carriage e should be continued until the cutter has been carried entinel y beyond reach of the sharpening-wheel, and of the guidinglstop u, lwhen such cutter is to be revolved to the extent (if-one tooth and retracted to its startingpoint, which subjects the next successive tooth to the action of the reducing-wheel, these movements being repeated until Athe teeth ofthe entire cutter have been acted upon, when suoli cutter is to be removed, and a new one substituted.

I am aware that for sharpening a certain class of cutters, a machine has been invented, in' which an emery-wheel or grindstone has been made to bear upon and grind the surface of the teeth of luted rollers, in a direction at right angles to the longest plane of such teeth, the grinding-wheel or stone 'in this instance travelling, while the cutter remained at rest.

lhis machine, however, is entirely impracticable for sharpening the' class of cutters to which mine is applied, as the teethv of such cutters are disposed in such close proximity', one to the other, that the grinding-stone, if applied at right angles to their longest axis, would unavoidably strike the next adjacent tooth, with very Ainjurious results. In fact this old machine was not intended for or susceptible of performing the labor accomplished by that herein explained; f

That I claim, thereibre, and desire to secure by Letters Patent, is

1. The combination, with the sharpening-pincel and reciprocating carriagefof the cutter-holding mandrel, arranged in or parallel with the plane of rotation of the wheel, and supported in independentlyadjustable bearings, substantially as described, so that the mandrel may be adjusted at either. end to bring it into proper position to receive the tapering or other-shaped fluted cutter to be acted upon by the wheel.

2. In combination with the shaipening-wheel, and

-sliding or recipropatingl carriage, and cutter-holding mandrel, arranged'in or parallel with the plane of rotation cf said wheel, as described, the employment of a guiding-plate or stop, aiiixed to the stationary partof the machine, and arranged to enga-ge with the cutter-teeth during the reciprocations of the carriagc, as set forth. y

3. The combination of the sharpening-wheel and cam, forimparting an endwise motion to its shaft, ing-wheel, and cam for imparting an endwise motion with the reciprocating carriage and cutter-holding to the same, and the guiding-plate or stop for holdmandrel, arranged to move in or parallel with the ing in position the cutter-teeth, lare combined and the plane of rotation of said wheel, substantially as arranged, with relation to each other, and for joint shown and set forth.- operation, as herein shown and described.

4. A machine for grinding and sharpening iiuted AURY G. GOES. l cutters, in which the vertically-adjustable recipr'o- Witnesses: eating earn-lage, the cutter-supporting mandrel and ORRIN F. BATTEY,

its'adjustable end-hearings, the revolving sharpen- JOHN H. GOES. 

